diff --git a/server/channels/api4/post.go b/server/channels/api4/post.go
index 64a0d4eb4f..8000bc79cf 100644
--- a/server/channels/api4/post.go
+++ b/server/channels/api4/post.go
@@ -144,7 +144,7 @@ func createPost(c *Context, w http.ResponseWriter, r *http.Request) {
 	if setOnline != "" {
 		setOnlineBool, err2 = strconv.ParseBool(setOnline)
 		if err2 != nil {
-			mlog.Warn("Failed to parse set_online URL query parameter from createPost request", mlog.Err(err2))
+			c.Logger.Warn("Failed to parse set_online URL query parameter from createPost request", mlog.Err(err2))
 			setOnlineBool = true // Set online nevertheless.
 		}
 	}
@@ -211,7 +211,7 @@ func createEphemeralPost(c *Context, w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	if err := rp.EncodeJSON(w); err != nil {
-		mlog.Warn("Error while writing response", mlog.Err(err))
+		c.Logger.Warn("Error while writing response", mlog.Err(err))
 	}
 }
 
@@ -239,7 +239,7 @@ func getPostsForChannel(c *Context, w http.ResponseWriter, r *http.Request) {
 	if sinceString != "" {
 		since, parseError = strconv.ParseInt(sinceString, 10, 64)
 		if parseError != nil {
-			c.SetInvalidParam("since")
+			c.SetInvalidParamWithErr("since", parseError)
 			return
 		}
 	}
@@ -323,7 +323,7 @@ func getPostsForChannel(c *Context, w http.ResponseWriter, r *http.Request) {
 	}
 
 	if err := clientPostList.EncodeJSON(w); err != nil {
-		mlog.Warn("Error while writing response", mlog.Err(err))
+		c.Logger.Warn("Error while writing response", mlog.Err(err))
 	}
 }
 
@@ -389,7 +389,7 @@ func getPostsForChannelAroundLastUnread(c *Context, w http.ResponseWriter, r *ht
 		w.Header().Set(model.HeaderEtagServer, etag)
 	}
 	if err := clientPostList.EncodeJSON(w); err != nil {
-		mlog.Warn("Error while writing response", mlog.Err(err))
+		c.Logger.Warn("Error while writing response", mlog.Err(err))
 	}
 }
 
@@ -454,7 +454,7 @@ func getFlaggedPostsForUser(c *Context, w http.ResponseWriter, r *http.Request)
 		return
 	}
 	if err := clientPostList.EncodeJSON(w); err != nil {
-		mlog.Warn("Error while writing response", mlog.Err(err))
+		c.Logger.Warn("Error while writing response", mlog.Err(err))
 	}
 }
 
@@ -496,7 +496,7 @@ func getPost(c *Context, w http.ResponseWriter, r *http.Request) {
 
 	w.Header().Set(model.HeaderEtagServer, post.Etag())
 	if err := post.EncodeJSON(w); err != nil {
-		mlog.Warn("Error while writing response", mlog.Err(err))
+		c.Logger.Warn("Error while writing response", mlog.Err(err))
 	}
 }
 
@@ -640,7 +640,7 @@ func getPostThread(c *Context, w http.ResponseWriter, r *http.Request) {
 		var err error
 		perPage, err = strconv.Atoi(perPageStr)
 		if err != nil || perPage > web.PerPageMaximum {
-			c.SetInvalidParam("perPage")
+			c.SetInvalidParamWithErr("perPage", err)
 			return
 		}
 	}
@@ -650,7 +650,7 @@ func getPostThread(c *Context, w http.ResponseWriter, r *http.Request) {
 		var err error
 		fromCreateAt, err = strconv.ParseInt(fromCreateAtStr, 10, 64)
 		if err != nil {
-			c.SetInvalidParam("fromCreateAt")
+			c.SetInvalidParamWithErr("fromCreateAt", err)
 			return
 		}
 	}
@@ -721,7 +721,7 @@ func getPostThread(c *Context, w http.ResponseWriter, r *http.Request) {
 	w.Header().Set(model.HeaderEtagServer, clientPostList.Etag())
 
 	if err := clientPostList.EncodeJSON(w); err != nil {
-		mlog.Warn("Error while writing response", mlog.Err(err))
+		c.Logger.Warn("Error while writing response", mlog.Err(err))
 	}
 }
 
@@ -808,7 +808,7 @@ func searchPosts(c *Context, w http.ResponseWriter, r *http.Request, teamId stri
 
 	w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
 	if err := results.EncodeJSON(w); err != nil {
-		mlog.Warn("Error while writing response", mlog.Err(err))
+		c.Logger.Warn("Error while writing response", mlog.Err(err))
 	}
 }
 
@@ -881,7 +881,7 @@ func updatePost(c *Context, w http.ResponseWriter, r *http.Request) {
 	auditRec.AddEventResultState(rpost)
 
 	if err := rpost.EncodeJSON(w); err != nil {
-		mlog.Warn("Error while writing response", mlog.Err(err))
+		c.Logger.Warn("Error while writing response", mlog.Err(err))
 	}
 }
 
@@ -947,7 +947,7 @@ func patchPost(c *Context, w http.ResponseWriter, r *http.Request) {
 	auditRec.AddEventResultState(patchedPost)
 
 	if err := patchedPost.EncodeJSON(w); err != nil {
-		mlog.Warn("Error while writing response", mlog.Err(err))
+		c.Logger.Warn("Error while writing response", mlog.Err(err))
 	}
 }